Mirador viewer

SyntaxError: Unexpected token '<', "<!DOCTYPE "... is not valid JSON

{
  "manifest": {
    "error": "SyntaxError: Unexpected token '<', \"<!DOCTYPE \"... is not valid JSON",
    "id": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/377/manifest.json",
    "isFetching": false
  },
  "window": {
    "collectionIndex": 0,
    "companionAreaOpen": true,
    "companionWindowIds": [
      "cw-f364d009-3efd-4c33-a1a5-a34a31754c86",
      "cw-d7778ee1-7b18-48a4-beee-3f7dd0a2b93c"
    ],
    "draggingEnabled": true,
    "highlightAllAnnotations": false,
    "id": "window-22208d9e-7464-45d7-9868-77a3fd9fa16c",
    "manifestId": "https://cdm16022.contentdm.oclc.org/iiif/info/p16022coll205/377/manifest.json",
    "maximized": false,
    "rangeId": null,
    "rotation": null,
    "selectedAnnotations": {},
    "sideBarOpen": false,
    "sideBarPanel": "info",
    "thumbnailNavigationId": "cw-d7778ee1-7b18-48a4-beee-3f7dd0a2b93c"
  }
}